Kotlin List minOfWith()
Syntax & Examples

Syntax of List.minOfWith()

The syntax of List.minOfWith() extension function is:

fun <T, R> Iterable<T>.minOfWith( comparator: Comparator<in R>, selector: (T) -> R ): R

This minOfWith() extension function of List returns the smallest value according to the provided comparator among all values produced by selector function applied to each element in the collection.


✐ Examples

1 Example

In this example,

  • We create a list of doubles named list containing elements 3.5, 1.2, 7.8, 4.3, 5.1.
  • We use the minOfWith() function with a comparator that compares elements directly and a selector that returns the elements themselves.
  • The minimum value in the list, min, is printed to standard output using println statement.

Kotlin Program

fun main(args: Array<String>) {
    val list = listOf(3.5, 1.2, 7.8, 4.3, 5.1)
    val min = list.minOfWith(Comparator { a, b -> a.compareTo(b) }, { it })
    println("Minimum value: \$min")
}

Output

Minimum value: 1.2

2 Example

In this example,

  • We create a list of characters named list containing elements 'a', 'b', 'c'.
  • We use the minOfWith() function with a comparator that converts characters to integers for comparison and a selector that converts characters to integers.
  • The minimum value in the list, min, is printed to standard output using println statement.

Kotlin Program

fun main(args: Array<String>) {
    val list = listOf('a', 'b', 'c')
    val min = list.minOfWith(Comparator { a, b -> a.toInt().compareTo(b.toInt()) }, { it })
    println("Minimum value: \$min")
}

Output

Minimum value: a

3 Example

In this example,

  • We create a list of strings named list containing elements "apple", "banana", "cherry".
  • We use the minOfWith() function with a comparator that compares string lengths and a selector that returns the length of each string.
  • The minimum value in the list, min, is printed to standard output using println statement.

Kotlin Program

fun main(args: Array<String>) {
    val list = listOf("apple", "banana", "cherry")
    val min = list.minOfWith(Comparator { a, b -> a.length.compareTo(b.length) }, { it })
    println("Minimum value: \$min")
}

Output

Minimum value: apple

Summary

In this Kotlin tutorial, we learned about minOfWith() extension function of List: the syntax and few working examples with output and detailed explanation for each example.